Bump version to 26.9.0

[nicomiguelino]

Summary

• Bumps the version to 26.9.0 (Calendar Versioning: year 26, month 9, first release this month) in Cargo.toml, Cargo.lock, action.yml, and Dockerfile, following the documented release process in README.md.

Test plan

• cargo build, Cargo.lock regenerated with the new version

[Copilot]

🟢 Approval recommended

The changes are a straightforward, consistent version bump across all referenced distribution/build files with no functional logic modifications.

Pull request overview

This PR updates the Screenly CLI release version to 26.9.0 across build, packaging, and distribution entry points to align with the documented calendar-versioning release process.

Changes:

• Bumped crate version to 26.9.0 in Cargo.toml and synced Cargo.lock.
• Updated the GitHub Action default cli_version to v26.9.0.
• Updated the Docker image build ARG to download v26.9.0 release artifacts.

File summaries

File	Description
Dockerfile	Updates the release tag used to download the CLI artifact during image build.
Cargo.toml	Bumps the crate/package version to 26.9.0.
Cargo.lock	Regenerates lock entry to reflect the new crate version.
action.yml	Updates the default CLI version used by the composite GitHub Action.

Review details

• Files reviewed: 3/4 changed files
• Comments generated: 0
• Review effort level: Lite

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